<template>
    <div>
         <!--使用面包屑导航区域-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!--卡片视图-->
        <el-card>
            <!--提示区-->
            <el-alert
                title="添加商品信息"
                type="info"
                center
                show-icon
                :closable="false">
            </el-alert>
            <!--步骤条区域-->
            <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center="">
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
            </el-steps>
            <!--tab栏区域-->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs :tab-position="'left'"  v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                            v-model="addForm.goods_cat"
                            :options="catelist"
                            :props="cateProps"
                            @change="handleChange"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!--渲染表单的Item项-->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border=""></el-checkbox>                              
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals" ></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!--action 表示图片要上传到后台的API地址 el-upload有自己的阿贾克斯，没有调用axios所有要再配置token-->
                        <el-upload
                        :action="uploadURL"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture" 
                        :headers="headerObj" :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!--富文本编辑器组件-->
                         <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!--添加商品的按钮-->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!--图片预览-->
        <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="30%"> 
        <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'

export default {
    data(){
        return {
            activeIndex:'0',
            //添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                //商品所属的分类数组
                goods_cat:[],
                //图片的数组
                pics:[],
                //商品的详情描述
                goods_introduce:'',
                attrs:[]
            },
            addFormRules:{
                goods_name:[{required: true, message: '请输入商品名称', trigger: 'blur' }],
                goods_price:[{required: true, message: '请输入商品价格', trigger: 'blur' }],
                goods_weight:[{required: true, message: '请输入商品重量', trigger: 'blur' }],
                goods_number:[{required: true, message: '请输入商品数量', trigger: 'blur' }],
                goods_cat:[{required: true, message: '请选择商品分类', trigger: 'blur' }]
            },
            //商品分类列表
            catelist:[],
            cateProps:{               
                label:'cat_name',
                value:'cat_id',
                children:'children',
                expandTrigger: 'hover',
            },
            //动态参数列表数据
            manyTableData:[],
            //静态属性列表数据
            onlyTableData:[],
            //上传图片的url地址
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            //图片上传组件的headers请求头对象
            headerObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisible:false
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        //获取所有商品分类数据
        async getCateList(){
            const {data:res}=await this.$http.get('categories')
            if(res.meta.status!==200){
                return this.$message.error('获取商品分类数据失败')
            }
            this.catelist=res.data
            console.log(this.catelist)
        },
        //级联选择器选中项变化，会触发这个函数
        handleChange(){
            console.log(this.addForm.goods_cat)
            if(this.addForm.goods_cat.length!==3){
                this.addForm.goods_cat=[]
            }
        },
        beforeTabLeave(activeName,oldActiveName){
            console.log('即将离开的标签页名字是'+oldActiveName)
            console.log('即将进入的标签页名字是'+activeName)
            if(oldActiveName==='0'&&this.addForm.goods_cat.length!==3){
                this.$message.error('请先选择商品分类')
                return false
            }
        },
        async tabClicked(){
            if(this.activeIndex==='1'){
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
                if(res.meta.status!==200){
                return this.$message.error('获取动态参数列表失败')
                }
                console.log(res.data)
                res.data.forEach(item=>{
                    item.attr_vals=item.attr_vals.length===0?[]:item.attr_vals.split(' ')
                })
                this.manyTableData=res.data
            }else if(this.activeIndex==='2'){
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
                if(res.meta.status!==200){
                return this.$message.error('获取静态属性列表失败')
                
                }
                console.log(res.data)
                this.onlyTableData=res.data
            }
        },
        //处理图片预览效果
        handlePreview(file){
            console.log(file)
            this.previewPath=file.response.data.url
            this.previewVisible=true
        },
        //处理移除图片的操作
        handleRemove(file){
            console.log(file)
            //1.获取将要删除的图片的临时路径
            const filePath=file.response.data.tmp_path
            //2.从pics数组中，找到这个图片对应的索引值
            const i= this.addForm.pics.findIndex(x=>
            x.pic==filePath)
            this.addForm.pics.splice(i,1)
            console.log(this.addForm)
        },
        //监听图片上传成功的事件
        handleSuccess(response){
            console.log(response)
            //1.拼接得到一个图片信息对象
            const picInfo={pic:response.data.tmp_path}
            //2.将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm)
        },
        //添加商品
        add(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid){
                    return this.$message.error('请填写必要的表单项')
                }
                //执行添加的业务逻辑
                //lodash cloneDeep(obj)
                const form=_.cloneDeep(this.addForm)
                form.goods_cat=form.goods_cat.join(',')
                console.log(form)
                //处理动态参数
                this.manyTableData.forEach(item=>{
                    const newInfo={attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })               
                //处理静态属性
                this.onlyTableData.forEach(item=>{
                    const newInfo={attr_id:item.attr_id,attr_value:item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs=this.addForm.attrs
                console.log(form)
                //发起请求添加商品
                //商品名称必须是唯一的
                 const {data:res}=await this.$http.post('goods',form)
                 if(res.meta.status!==201){
                     return this.$message.error('添加商品失败')
                 }
                 this.$message.success('添加商品成功')
                 this.$router.push('/goods')
            })
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length===3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 5px 0 0 !important;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>
